If you know how many pixels wide and/or large you want the image to be, leave “Pixels” selected in the second drop-down menu, then enter the new width or height in pixels. For example, if you want the image to be 800 pixels wide, type 800 into the “Width” box. Entering the width will automatically change the height due to the “Constrain Proportions” setting. To increase the size by percent instead of by specifying the exact width or height in pixels, select “percent” from the drop-down menus, then type the percentage by which you want to increase the size. For example, to increase the image size by 20%, select percent from the drop-downs under “Pixel Dimensions,” then type 20 into either the width or height box.
To save your changes, click the File menu and select Save.
